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Paper Abstract and Keywords
Presentation 2011-11-21 17:20
On Amplification by Weak Measurement
Tatsuhiko Koike, Saki Tanaka (Keio Univ)
Abstract (in Japanese) (See Japanese page) 
(in English) The amplification by a weak quantum measurement proposed by Aharonov, Albert, and Vaidman is
studied in the case of a Sagnac interferometer,
where a small tilt of a mirror isamplified into a large lateral displacement of a laser beam, by taking into account
the coupling between the measured system and the measuring device
to all orders.
The previous theoretical treatment,
which is valid only to the first order in the coupling,
predicts
that the measured displacement and the amplification factor can be made arbitrarily large
at the cost of reducing the output laser intensity because they are proportional to the weak value.
We show that
they are not proportional to the weak value
and vanish in the limit of zero output intensity.
We also derive the condition of the pre- and post-selected states
to give the maximum amplification.
Keyword (in Japanese) (See Japanese page) 
(in English) Weak measurement / Weak value / Quantum measurement / Amplification / / / /  
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Conference Information
Committee QIT  
Conference Date 2011-11-21 - 2011-11-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Osaka Univ. Engr. Sci. Sigma Hall (Toyonaka) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information, etc. 
Paper Information
Registration To QIT 
Conference Code 2011-11-QIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) On Amplification by Weak Measurement 
Sub Title (in English)  
Keyword(1) Weak measurement  
Keyword(2) Weak value  
Keyword(3) Quantum measurement  
Keyword(4) Amplification  
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1st Author's Name Tatsuhiko Koike  
1st Author's Affiliation Keio University (Keio Univ)
2nd Author's Name Saki Tanaka  
2nd Author's Affiliation Keio University (Keio Univ)
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Speaker Author-2 
Date Time 2011-11-21 17:20:00 
Presentation Time 20 minutes 
Registration for QIT 
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